Received-SPF: pass (google.com: best guess record for domain of linux-kernel-owner@vger.kernel.org designates 209.132.180.67 as permitted sender) client-ip=209.132.180.67;
From:   Vitaly Kuznetsov <vkuznets@redhat.com>
To:     Sasha Levin <sashal@kernel.org>
Cc:     linux-hyperv@vger.kernel.org, linux-kernel@vger.kernel.org,
        x86@kernel.org, "K. Y. Srinivasan" <kys@microsoft.com>,
        Haiyang Zhang <haiyangz@microsoft.com>,
        Stephen Hemminger <sthemmin@microsoft.com>,
        Thomas Gleixner <tglx@linutronix.de>,
        Ingo Molnar <mingo@redhat.com>, Borislav Petkov <bp@alien8.de>,
        "H. Peter Anvin" <hpa@zytor.com>,
        Roman Kagan <rkagan@virtuozzo.com>,
        Michael Kelley <mikelley@microsoft.com>,
        Joe Perches <joe@perches.com>
Subject: Re: [PATCH v3] x86/hyper-v: micro-optimize send_ipi_one case
In-Reply-To: <20191027151938.7296-1-vkuznets@redhat.com>
References: <20191027151938.7296-1-vkuznets@redhat.com>
Date:   Thu, 07 Nov 2019 14:26:53 +0100
Message-ID: <877e4bbyw2.fsf@vitty.brq.redhat.com>
MIME-Version: 1.0
Content-Type: text/plain
Sender: linux-kernel-owner@vger.kernel.org
Precedence: bulk

Vitaly Kuznetsov <vkuznets@redhat.com> writes:

> When sending an IPI to a single CPU there is no need to deal with cpumasks.
> With 2 CPU guest on WS2019 I'm seeing a minor (like 3%, 8043 -> 7761 CPU
> cycles) improvement with smp_call_function_single() loop benchmark. The
> optimization, however, is tiny and straitforward. Also, send_ipi_one() is
> important for PV spinlock kick.
>
> I was also wondering if it would make sense to switch to using regular
> APIC IPI send for CPU > 64 case but no, it is twice as expesive (12650 CPU
> cycles for __send_ipi_mask_ex() call, 26000 for orig_apic.send_IPI(cpu,
> vector)).
>
> Signed-off-by: Vitaly Kuznetsov <vkuznets@redhat.com>
> ---
> Changes since v2:
>  - Check VP number instead of CPU number against >= 64 [Michael]
>  - Check for VP_INVAL

Hi Sasha,

do you have plans to pick this up for hyperv-next or should we ask x86
folks to?

Thanks!

-- 
Vitaly